package project.utils;

import com.alibaba.druid.pool.DruidDataSource;
import com.alibaba.druid.pool.DruidDataSourceFactory;
import com.alibaba.druid.pool.DruidPooledConnection;

import java.io.InputStream;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.Properties;

/*
杨威
2021/9/7
19:09
*/
public class DruidUtil {
    private static DruidDataSource ds;
    private static ThreadLocal<Connection> threadLocal=new ThreadLocal();
    static {
        try {
            Properties properties=new Properties();
            InputStream resourceAsStream = DruidUtil.class.getResourceAsStream("/db.properties");
            properties.load(resourceAsStream);
            ds= (DruidDataSource)DruidDataSourceFactory.createDataSource(properties);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    public static Connection getConnection(){
        Connection connection = threadLocal.get();
        try {
            if(connection==null){
                connection = ds.getConnection();
                threadLocal.set(connection);
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return connection;
    }

    public static void begin(){
        try {
            Connection connection = getConnection();
            connection.setAutoCommit(false);
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
    public static void commit(){
        try {
            Connection connection = getConnection();
            connection.commit();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
    public static void rollback(){
        try {
            Connection connection=getConnection();
            connection.rollback();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
    public static void close(){
        Connection connection = getConnection();
        try {
            connection.close();
            threadLocal.remove();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}
